1.Package Includes: you will receive 12 pcs puppy collars of assorted colors, sufficient enough to meet your needs.2.Size: each puppy collar is 34cm/13.4 inch long and 1cm/0.4 inch wide. The length is adjustable, so it will adjust easily as your puppies grow and stay on very well.3.Material: these puppy ID collars are made of premium nylon and polyester, have velvet on both sides and very lightweight, which is very comfortable and soft to your pets.4.Application: Put them on the neck of your newborn puppies, so you can identify them with the collar’s color which are very bright, making it easy for you to track your pet.5.Note: the collar can be trimmed off to fit you pet’s neck. It's recommended to purchase a couple of sets to replace the trimmed ones with full size ones. Please keep the collars away from water otherwise the stickiness would get weaken.